在工业化生产线上采用双合金法,通过优化主合金铸片结构制备了最大磁能积415 k J·m-3,内禀矫顽力1027 kA·m-1的高性能烧结钕铁硼磁体,磁体具有高抗腐蚀性,在121℃,0.27 MPa,相对湿度100％的环境中,经过168h后磁体单位面积失重为2.08 mg·cm-2.重点研究了主合金铸片结构对磁体组织及性能影响:由于稀土含量低,采用一般速凝工艺时主合金Nd28.0 Fe70 Co1.0B1.0铸片的自由面附近出现大量树枝状α-Fe,最终制备的磁体中存在大尺寸富Nd团聚,晶粒边界不平整,磁体密度较低为7.45 g·cm-3,矫顽力只有870 kA·m-1;通过改进速凝工艺,Nd28.0 Fe70 Co1.0B1.0铸片结构优化,铸片中α-Fe相析出基本被抑制,柱状晶厚度为3～4 μm,连续生长.最终制备磁体富Nd相团聚减少,晶粒边界平直、光滑.最终制备的磁体密度提高到7.57 g·cm-3,矫顽力大幅提升到1027 kA·m-1.
参考文献
| [1] | 麦杰平,李红卫,于敦波,罗阳,李扩社,王民.HDDR工艺对各向同性NdFeB磁粉性能的影响[J].稀有金属,2011(06):855-859. |
| [2] | 王士显,于敦波,李红卫,罗阳,李扩社.快淬SmFe合金相结构及显微组织研究[J].稀有金属,2012(05):721-726. |
| [3] | Tomoki Fukagawa;Satoshi Hirosawa .Coercivity generation of surface Nd_(2)Fe_(14)B grains and mechanism of fcc-phase formation at the Nd/Nd_(2)Fe_(14)B interface in Nd-sputtered Nd-Fe-B sintered magnets[J].Journal of Applied Physics,2008(1):013911-1-013911-6-0. |
| [4] | 成问好,李卫,李传健,郭朝晖,赵文彤.制取低温度系数Nd-Fe-B磁体的混合合金法工艺[J].稀有金属材料与工程,2002(01):52-55. |
| [5] | Wu, Y.;Ni, J.;Ma, T.;Yan, M. .Corrosion resistance of NdFeB sintered magnets with intergranular addition of Cu_(60)Zn_(40) powders[J].Physica, B. Condensed Matter,2010(16):3303-3307. |
| [6] | Ni, J.J.;Ma, T.Y.;Wu, Y.R.;Yan, M. .Effect of post-sintering annealing on microstructure and coercivity of Al_(85)Cu_(15)-added NdFeB sintered magnets[J].Journal of Magnetism and Magnetic Materials,2010(22):3710-3713. |
| [7] | Cui, XG;Yan, M;Ma, TY;Yu, LQ .Effects of Cu nanopowders addition on magnetic properties and corrosion resistance of sintered Nd-Fe-B magnets[J].Physica. B, Condensed Matter,2008(23/24):4182-4185. |
| [8] | Yu LQ;Yan M;Wu JM;Luo W;Cui XG;Ying HG .On the cooling rate of strip cast ingots for sintered NdFeB magnets[J].Physica, B. Condensed Matter,2007(1/2):1-5. |
| [9] | Xu Jing,Yan Shihong,Yu Dunbo,Li Zongan,Li Shipeng,Li Hongwei.Influence of Solidification Rate on Microstructures of Cast Strips and Corresponding Sintered NdFeB Magnets[J].稀土学报（英文版）,2006(z2):306-309. |
| [10] | Bernardi J.;Sagawa M.;Hirose Y.;Fidler J. .Microstructural analysis of strip cast Nd-Fe-B alloys for high (BH)(max) magnets[J].Journal of Applied Physics,1998(11 Pt.2):6396-6398. |
| [11] | Fidler J.;Schrefl T. .OVERVIEW OF ND-FE-B MAGNETS AND COERCIVITY[J].Journal of Applied Physics,1996(8 Pt.2a):5029-5034. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%